tacoman528: Then wouldn't there need to be some energy to start the big bang.
DNAunion: Maybe. One hypothesis holds that the amount of positive energy in our Universe is exactly balanced by the amount of negative energy, such as gravity (binding energies are considered to be negative). If that turns out to be the case, then there is NOW a net of 0 energy in the Universe. So it could have been no energy originally, with the positive and negative energies then being released at the same instant in a conserved manner. It would all balance out to 0 energy, all the time.
Think about it this way. Pair creation can involve the simultaneous formation of an electron and a positron (this is established fact). Once they are formed, the electron has a charge of 1- and the positron has a charge of 1+; but their net charge is still 0. Before they were created, there was no charge. After they were created, there was still no NET charge, yet there was a positive 1 and a negative 1 charge. As long as total charge is conserved, no violation occurs in the creation of positive charge. Similarly, as long as total energy is conserved, no violation occurs in the creation of positive energy.
Whether the positive and negative energies in our Universe do exactly balance to 0 is not known.
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